Orbiting a Scene with Camera1

Marcus SeverusMarcus Severus Posts: 691
edited April 2014 in Carrara Discussion

Would anyone be willing to help me understand the motion of Camera1 ? I want to orbit an object the camera is pointing at in a scene.

Suppose I want a two-second animation showing a turntable view of a cube. If I leave Camera1 alone I can rotate the cube, advance along the timeline, rotate a bit more, etc.

But if I leave the cube alone and try to orbit it with the camera by using the trackball (dolly), it looks fine while I'm setting it up: the cube stays within the production frame and I expect to be able to render an orbit of the cube.

But when I press Play - the cube sweeps around towards or away from the camera and out of the production frame.

If I check what's happened by scrubbing along the timeline using the top view, the camera icon moves in a straight line from one keyframe to the next. So if there are four keyframes there are four camera positions, forming a kind of square. Do I need to create some kind of circular path for the camera or is there an easier way? (I saw a reference to Cripeman's tutorial on animating along a path in another post - this may be the solution.)

Or do tweeners come into this?

It seems a pity that what looks like a preview when using the dolly isn't OK on playback.

Edited to add a couple of words

Post edited by Marcus Severus on

Comments

  • head waxhead wax Posts: 6,376
    edited April 2014

    hello long time since I animated but try this
    assuming you can move the hotpoint of a camera
    place the camera hot point on your object (move hot point by caps lock- i do it automatically I never look at the key?) and dragging the manipulator handles
    once the hot point is there the camera will revolve around the secen centre

    you can also play with the point at modifier to keep the camera pointing at the right thing

    you could also parent the camera to a target and revolve the target

    this will start you on the path at least

    see http://www.daz3d.com/forums/discussion/555/#8222

    also see http://www.polyloop.net/showthread.php/4973-C4-C5-Create-and-animate-a-Targeted-Camera-with-Carrara but is garbled html

    Post edited by head wax on
  • 3DAGE3DAGE Posts: 3,274
    edited December 1969

    HI Marcus :)

    "Tweeners" are the frames between Key-frsmes, so, Yes,. they are involved here, but just a wee bit.

    Orbiting an object can be done easily by parenting the Camera1, to an object which has a spin modifier applied to it. ...

    If you Insert a target helper object place it where you want to rotate around,... position your camera as you want it,.
    then Drag the Camera1 (name) in the Scene, Instance list, (bottom right panel) and drop it onto the Target helper Object (name) in the list,..
    The Camera becomes a "child" object of the Target helper "parent",... meaning that if the "Target helper" moves, then the "Camera" has to move with it.

    Now you can add a "Spin" Modifier to make the Target helper object rotate.

    Select the Target helper object,.
    Go to the Top right panels ,and select the Modifiers panel.
    Click the little + button,. and select "Spin".

    The Speed controls,.
    The default speed is one cycle per second.
    you can change that to something like 0.25, for a four second rotation.
    Type a minus - value to rotate anti-clockwise. EG: -0.25

    Once you've set the Speed of rotation,..
    Try scrubbing the time-line.
    The camera should be spinning perfectly.

    You could use other objects as a "Parent" for the Camera,.(as long as you make them invisible for the final render) but a target helper object is simple,.. and doesn't render.

    Hope it helps :)

  • 3DAGE3DAGE Posts: 3,274
    edited December 1969

    HI Head Wax :)

    G'day. :)

    you beat me to it.. .. again.

  • DartanbeckDartanbeck Posts: 13,966
    edited April 2014

    Yeah... it's the bezier tweener on the camera track that's making your view get all funky. Open the Sequencer along the bottom, select the space between the keyframes for the camera in question, and look to the right panel. Under tweener type, change the drop-down selection to linear and you'll have it. ;)

    SetTweener.jpg
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    Post edited by Dartanbeck on
  • evilproducerevilproducer Posts: 8,789
    edited April 2014

    Yeah... it's the bezier tweener on the camera track that's making your view get all funky. Open the Sequencer along the bottom, select the space between the keyframes for the camera in question, and look to the right panel. Under tweener type, change the drop-down selection to linear and you'll have it. ;)

    Hey Dart, it sounds to me from the description that it's not the bezier tweener. It would be the same issue with the Linear tweener. The issue is the shortest distance between two points is a straight line. Carrara is moving the camera in the most efficient method between the four key frames.

    Both Andy's and Andrew's methods- move camera hotpoint or parent camera to target helper object and then the spin modifier for both options would be the fastest and smoothest way to go.

    Post edited by evilproducer on
  • head waxhead wax Posts: 6,376
    edited December 1969

    3DAGE said:
    HI Head Wax :)

    G'day. :)

    you beat me to it.. .. again.

    oh I was just loitering Andy :)

    I have a new hat so I thought I would talk through it :)

    cheers from oz!

  • DartanbeckDartanbeck Posts: 13,966
    edited December 1969


    Hey Dart, it sounds to me from the description that it's not the bezier tweener. It would be the same issue with the Linear tweener. The issue is the shortest distance between two points is a straight line. Carrara is moving the camera in the most efficient method between the four key frames.

    Both Andy's and Andrew's methods- move camera hotpoint or parent camera to target helper object and then the spin modifier for both options would be the fastest and smoothest way to go.

    I see...
    Must have gone insane for a second there... sorry about that :ahhh:

    Today was a strange one. Barely being able to check back here... and things got a bit exciting for me... so all I wanted to do is get back here, but I kept getting hauled away... argh!

    Hi Andy and Andrew! So it's the ol' move the hot point trick, eh? I love moving the hot point :)

  • RoygeeRoygee Posts: 2,220
    edited December 1969

    Hi head wax - good to see you posting again :) I was worried that the oz fires had got you!

  • Max TurladMax Turlad Posts: 84
    edited April 2014

    3DAGE said:
    HI Marcus :)

    "Tweeners" are the frames between Key-frsmes, so, Yes,. they are involved here, but just a wee bit.

    Orbiting an object can be done easily by parenting the Camera1, to an object which has a spin modifier applied to it. ...

    If you Insert a target helper object place it where you want to rotate around,... position your camera as you want it,.
    then Drag the Camera1 (name) in the Scene, Instance list, (bottom right panel) and drop it onto the Target helper Object (name) in the list,..
    The Camera becomes a "child" object of the Target helper "parent",... meaning that if the "Target helper" moves, then the "Camera" has to move with it.

    Now you can add a "Spin" Modifier to make the Target helper object rotate.

    Select the Target helper object,.
    Go to the Top right panels ,and select the Modifiers panel.
    Click the little + button,. and select "Spin".

    The Speed controls,.
    The default speed is one cycle per second.
    you can change that to something like 0.25, for a four second rotation.
    Type a minus - value to rotate anti-clockwise. EG: -0.25

    Once you've set the Speed of rotation,..
    Try scrubbing the time-line.
    The camera should be spinning perfectly.

    You could use other objects as a "Parent" for the Camera,.(as long as you make them invisible for the final render) but a target helper object is simple,.. and doesn't render.

    Hope it helps :)

    Hi, following the mini tutorial by 3DAGE, I made this little movie. I added items to show various objects in space, as mentioned in the tutorial the camera follows the spin rotation of the target helper object (positioned in the middle of the scene, just below the icosahedron).

    I know, it's a small thing, but I'm like a sponge: I follow constantly almost all posts, learn, I understand (or not :P ), do experiments, I try and try again. :cheese: and I would like to thank to all of this fabulous community for the great work.


    Ciao, Max.

    spinRot.gif
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    Post edited by Max Turlad on
  • Marcus SeverusMarcus Severus Posts: 691
    edited December 1969

    To Headwax, 3Dage, Dartanbeck, evilproducer,roygee,sbilf

    Many thanks for all your helpful replies.

    Tutorials, screenshots, example animation - thanks for the trouble you went to.

    I thought when posting that it would be a one-line answer (use 'point at' - which is greyed out for me - or something similar).

    The solutions are very clever - I need to get these nailed because I often want to see the small things I've done in turntable view and it has always proved baffling.

  • DartanbeckDartanbeck Posts: 13,966
    edited April 2014

    You'll be amazed at how quickly all of this becomes a second nature flick of the wrist, sort of thing.
    The more time you spend putting things in motion, the more it becomes clear that Carrara has little animation helpers all over it - in everything. It just gets easier and even more appetite-pleasing as experience builds... I love it! :ahhh:

    Post edited by Dartanbeck on
  • Marcus SeverusMarcus Severus Posts: 691
    edited December 1969

    I've had the experience of helping people use bespoke Windows programs for data entry. When I showed that they could tab from one field to the next, instead of clicking with the mouse to get there, they were delighted not to be doing an extra million mouse clicks a week.

    That isn't meant to be patronising - my job at the time was giving assistance and Windows was quite new to many people.

    The reason I'm recalling it is the thought that, in Carrara, I'm probably missing loads of efficient (or even elegant) ways to do things!

    Must re-visit Phil's training DVDs!

  • DartanbeckDartanbeck Posts: 13,966
    edited December 1969

    Yeah, that's the kind of thing I'm talking about. ;)

  • PhilWPhilW Posts: 4,669
    edited December 1969

    Must re-visit Phil's training DVDs!

    So must I! There must be stuff that I have forgotten... To come back to your original issue, using the camera parented to a target helper would be the way I would do it. You can use this technique to get some very complex motions very easily, and even parent one target helper to another for very complex motion paths.

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